Tire shake with P/G
#11
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Join Date: May 2003
Location: Coldwater, MI
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Originally Posted by TRChassis
Well we have tried just about everything, except transbraking it to 5,000. We usually use about 3-4000 rpm. We have tried changing the low end tune up, different tires and tire pressures. The tracks in this area are not the best, but they do prep them pretty good. I guess what I was getting at is that if there is a possibility the convertor is just locking up from the launch, in other words should I send it back and have it set up for a "softer launch" (if there is such a thing). We used to run lencos and could adjust the clutch a little for the shake but I am lost with this convertor/tire shake.
Rick
Rick
2 months ago a customer at the shop I wire for had massive shake issues with his blown dragster. We went to the track with him and a few different converters, tire shake massive with the 10", put the 9" in it and picked up 2 tenths and no tire shake. Went 6.92@191.
#12
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Join Date: Oct 2007
Location: Las Cruces, NM
Posts: 29
Re: ?
Originally Posted by bbchevy
Originally Posted by bbchevy
Rick,
I ALWAYS had My BLOWN/Alcohol converter set-up as TIGHT as they could make them!Thats what the Blower is For,........!Sounds to me Like your Tire Pressure is OFF?Or maybe take some B/V away and get After it a little HARDER!!
Hope that Helps,its NOT Much,but sometimes thats alls YOU Need?
Later
G 8)
I ALWAYS had My BLOWN/Alcohol converter set-up as TIGHT as they could make them!Thats what the Blower is For,........!Sounds to me Like your Tire Pressure is OFF?Or maybe take some B/V away and get After it a little HARDER!!
Hope that Helps,its NOT Much,but sometimes thats alls YOU Need?
Later
G 8)
Later
G 8)
Do you mean we need a tight converter or our problem is a tight convertor?
Thanks,
Rick
#13
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Join Date: Oct 2007
Location: Las Cruces, NM
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Originally Posted by hammertime
Originally Posted by TRChassis
Well we have tried just about everything, except transbraking it to 5,000. We usually use about 3-4000 rpm. We have tried changing the low end tune up, different tires and tire pressures. The tracks in this area are not the best, but they do prep them pretty good. I guess what I was getting at is that if there is a possibility the convertor is just locking up from the launch, in other words should I send it back and have it set up for a "softer launch" (if there is such a thing). We used to run lencos and could adjust the clutch a little for the shake but I am lost with this convertor/tire shake.
Rick
Rick
2 months ago a customer at the shop I wire for had massive shake issues with his blown dragster. We went to the track with him and a few different converters, tire shake massive with the 10", put the 9" in it and picked up 2 tenths and no tire shake. Went 6.92@191.
Thanks again,
Rick
#14
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Join Date: Mar 2003
Location: Fountain,MICHIGAN
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Re: ?
Originally Posted by TRChassis
Originally Posted by bbchevy
Originally Posted by bbchevy
Rick,
I ALWAYS had My BLOWN/Alcohol converter set-up as TIGHT as they could make them!Thats what the Blower is For,........!Sounds to me Like your Tire Pressure is OFF?Or maybe take some B/V away and get After it a little HARDER!!
Hope that Helps,its NOT Much,but sometimes thats alls YOU Need?
Later
G 8)
I ALWAYS had My BLOWN/Alcohol converter set-up as TIGHT as they could make them!Thats what the Blower is For,........!Sounds to me Like your Tire Pressure is OFF?Or maybe take some B/V away and get After it a little HARDER!!
Hope that Helps,its NOT Much,but sometimes thats alls YOU Need?
Later
G 8)
Later
G 8)
Do you mean we need a tight converter or our problem is a tight convertor?
Thanks,
Rick
Later
G 8)
GOOD Luck with that 8",.........
#15
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Join Date: May 2003
Location: Coldwater, MI
Posts: 2,998
Originally Posted by TRChassis
Originally Posted by hammertime
Originally Posted by TRChassis
Well we have tried just about everything, except transbraking it to 5,000. We usually use about 3-4000 rpm. We have tried changing the low end tune up, different tires and tire pressures. The tracks in this area are not the best, but they do prep them pretty good. I guess what I was getting at is that if there is a possibility the convertor is just locking up from the launch, in other words should I send it back and have it set up for a "softer launch" (if there is such a thing). We used to run lencos and could adjust the clutch a little for the shake but I am lost with this convertor/tire shake.
Rick
Rick
2 months ago a customer at the shop I wire for had massive shake issues with his blown dragster. We went to the track with him and a few different converters, tire shake massive with the 10", put the 9" in it and picked up 2 tenths and no tire shake. Went 6.92@191.
Thanks again,
Rick
#16
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Join Date: Jan 2006
Location: La.
Posts: 2,890
I run a 4000 stall 10" with my blown sm/blk, but it's probably apples and oranges because it's a door car. What most people donot understand is that a good blower is all in at 3000 rpm, you're not going to get more boost after that just more air flow.
Zip.
Zip.
#17
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Join Date: Oct 2007
Location: Las Cruces, NM
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Re: ?
Originally Posted by bbchevy
Originally Posted by TRChassis
Originally Posted by bbchevy
Originally Posted by bbchevy
Rick,
I ALWAYS had My BLOWN/Alcohol converter set-up as TIGHT as they could make them!Thats what the Blower is For,........!Sounds to me Like your Tire Pressure is OFF?Or maybe take some B/V away and get After it a little HARDER!!
Hope that Helps,its NOT Much,but sometimes thats alls YOU Need?
Later
G 8)
I ALWAYS had My BLOWN/Alcohol converter set-up as TIGHT as they could make them!Thats what the Blower is For,........!Sounds to me Like your Tire Pressure is OFF?Or maybe take some B/V away and get After it a little HARDER!!
Hope that Helps,its NOT Much,but sometimes thats alls YOU Need?
Later
G 8)
Later
G 8)
Do you mean we need a tight converter or our problem is a tight convertor?
Thanks,
Rick
Later
G 8)
GOOD Luck with that 8",.........
Rick
#18
Junior Member
JOURNEYMAN
Thread Starter
Join Date: Oct 2007
Location: Las Cruces, NM
Posts: 29
Originally Posted by hammertime
Originally Posted by TRChassis
Originally Posted by hammertime
Originally Posted by TRChassis
Well we have tried just about everything, except transbraking it to 5,000. We usually use about 3-4000 rpm. We have tried changing the low end tune up, different tires and tire pressures. The tracks in this area are not the best, but they do prep them pretty good. I guess what I was getting at is that if there is a possibility the convertor is just locking up from the launch, in other words should I send it back and have it set up for a "softer launch" (if there is such a thing). We used to run lencos and could adjust the clutch a little for the shake but I am lost with this convertor/tire shake.
Rick
Rick
2 months ago a customer at the shop I wire for had massive shake issues with his blown dragster. We went to the track with him and a few different converters, tire shake massive with the 10", put the 9" in it and picked up 2 tenths and no tire shake. Went 6.92@191.
Thanks again,
Rick
Rick
#19
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Join Date: May 2003
Location: Coldwater, MI
Posts: 2,998
Originally Posted by zipper06
I run a 4000 stall 10" with my blown sm/blk, but it's probably apples and oranges because it's a door car. What most people donot understand is that a good blower is all in at 3000 rpm, you're not going to get more boost after that just more air flow.
Zip.
Zip.
#20
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Join Date: Jan 2012
Posts: 628
"Apples and Oranges" . . Definitely!
Tire Shake, basically, is caused by not enough tire speed to keep the sidewall wrinkled and the sectional profile in a rectangle . . The cure is as varied as the vehicles susceptible to it . .
A FED really shouldn't be exhibiting a lot of it because of the inherent design and weight bias . . But it does happen . . Perhaps not enough negative pitch on the crank centerline . . More common on rear motored cars, blown altereds and blown door cars built to run in the 7 second and faster range . .
I'll go with the Tighter Converter suggestion. Awhile back I was the crew chief for a Blown Alky Altered and we stalled at 5000+ on the starting line . . 500" B Chrysler, 8-71, Hoosiers, 7 second car . . never had a tire shake problem.
On the Blower deal . . "3000 RPM and you're done" . . not really. Depends on your Blower and the pulleys you use . . If that were the concrete case, you wouldn't need to overdrive a Blower like we all do on a competition Engine . . and I underdrive the little 144 on my Street Rod so that in high gear I'm not running against compression, yet when I stand on it it starts working at 2650 engine RPM . . Noticeably!
Tire Shake, basically, is caused by not enough tire speed to keep the sidewall wrinkled and the sectional profile in a rectangle . . The cure is as varied as the vehicles susceptible to it . .
A FED really shouldn't be exhibiting a lot of it because of the inherent design and weight bias . . But it does happen . . Perhaps not enough negative pitch on the crank centerline . . More common on rear motored cars, blown altereds and blown door cars built to run in the 7 second and faster range . .
I'll go with the Tighter Converter suggestion. Awhile back I was the crew chief for a Blown Alky Altered and we stalled at 5000+ on the starting line . . 500" B Chrysler, 8-71, Hoosiers, 7 second car . . never had a tire shake problem.
On the Blower deal . . "3000 RPM and you're done" . . not really. Depends on your Blower and the pulleys you use . . If that were the concrete case, you wouldn't need to overdrive a Blower like we all do on a competition Engine . . and I underdrive the little 144 on my Street Rod so that in high gear I'm not running against compression, yet when I stand on it it starts working at 2650 engine RPM . . Noticeably!